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Nielsen BH, Thomsen PT, Green LE, Kaler J.Nielsen BH, et al.Prev Vet Med. 2012 Apr 1;104(1-2):44-52. doi: 10.1016/j.prevetmed.2011.10.002. Epub 2011 Oct 27.Prev Vet Med. 2012.PMID: 22036148Free article.